CN110726477B - Medium wave refrigeration type infrared imaging system capable of realizing passive temperature control and assembly method thereof - Google Patents
Medium wave refrigeration type infrared imaging system capable of realizing passive temperature control and assembly method thereof Download PDFInfo
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- CN110726477B CN110726477B CN201911032904.1A CN201911032904A CN110726477B CN 110726477 B CN110726477 B CN 110726477B CN 201911032904 A CN201911032904 A CN 201911032904A CN 110726477 B CN110726477 B CN 110726477B
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- 238000003331 infrared imaging Methods 0.000 title claims abstract description 27
- 238000005057 refrigeration Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000003287 optical effect Effects 0.000 claims abstract description 57
- 238000007789 sealing Methods 0.000 claims abstract description 33
- 238000003466 welding Methods 0.000 claims description 35
- 238000012546 transfer Methods 0.000 claims description 26
- 239000000565 sealant Substances 0.000 claims description 23
- 238000009413 insulation Methods 0.000 claims description 20
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 14
- 239000002131 composite material Substances 0.000 claims description 7
- 238000007747 plating Methods 0.000 claims description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052737 gold Inorganic materials 0.000 claims description 4
- 239000010931 gold Substances 0.000 claims description 4
- 239000004519 grease Substances 0.000 claims description 4
- 229920001296 polysiloxane Polymers 0.000 claims description 4
- 239000010410 layer Substances 0.000 description 21
- 238000003384 imaging method Methods 0.000 description 10
- 238000009434 installation Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000001291 vacuum drying Methods 0.000 description 4
- 238000004026 adhesive bonding Methods 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 239000005357 flat glass Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/0225—Shape of the cavity itself or of elements contained in or suspended over the cavity
- G01J5/024—Special manufacturing steps or sacrificial layers or layer structures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/0225—Shape of the cavity itself or of elements contained in or suspended over the cavity
- G01J5/0245—Shape of the cavity itself or of elements contained in or suspended over the cavity for performing thermal shunt
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/06—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity
- G01J5/068—Arrangements for eliminating effects of disturbing radiation; Arrangements for compensating changes in sensitivity by controlling parameters other than temperature
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The invention belongs to a medium wave refrigeration type infrared imaging system, and provides a medium wave refrigeration type infrared imaging system capable of realizing passive temperature control and an assembly method thereof, wherein a shell is sleeved outside a medium wave infrared optical lens, the front end of the shell is provided with an infrared optical window in a sealing way through a window seat, the rear end of the shell is in sealing connection with the outer surface of the medium wave infrared detector, and a sealing cavity is formed among the infrared optical window, the medium wave infrared optical lens, the medium wave infrared detector and the shell; the first cushion block is arranged between the L-shaped support and the refrigerator of the medium-wave infrared detector; the second cushion block is arranged between the base and the L-shaped support; one end of the heat pipe is inserted into the first cushion block, and the other end is inserted into the second cushion block. The assembly method is to meet the above-mentioned device tightness, as well as the accuracy of the system.
Description
Technical Field
The invention belongs to a medium wave refrigeration type infrared imaging system, and particularly relates to a medium wave refrigeration type infrared imaging system capable of realizing passive temperature control and an assembly method thereof.
Background
When the dark and weak targets in the medium wave band are detected in a long distance and large range at the environment temperature of-70 ℃ to +70 ℃, the illuminance generated by the self heat radiation of the imaging system on the image surface is increased along with the increase of the working temperature of the imaging system, the background noise of the system is increased along with the increase of the background noise of the system, the signal to noise ratio requirement can be met only by controlling the working temperature of the system below a specific temperature through analysis, and the system is limited by factors such as the installed volume, the bearing capacity, the power consumption, the field angle of the imaging system and the like. Therefore, the intermediate wave infrared imaging system needs to be subjected to passive temperature control treatment, and certain temperature control precision is ensured, so that the intermediate wave infrared imaging system works in the optimal temperature to ensure the detection effect.
In the aspect of passive thermal control of an imaging system, a technical scheme for performing thermal insulation treatment on a visible light camera is disclosed in patent application number 201010184943.6, but the scheme is not suitable for being used in a refrigeration type infrared imaging system because the scheme can cause cold reflection of an infrared system and the packaging is not suitable for the problem of a refrigeration detector.
Disclosure of Invention
The invention mainly aims to solve the technical problem that the imaging quality is affected when the temperature of a medium wave refrigeration type infrared imaging system is high, but the conventional passive thermal control device is not suitable for the refrigeration type infrared imaging system, and provides a medium wave refrigeration type infrared imaging system capable of realizing passive temperature control and an assembly method thereof.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The medium wave refrigeration type infrared imaging system capable of realizing passive temperature control comprises a medium wave infrared detector and a medium wave infrared optical lens, and is characterized by further comprising a heat transfer component, a shell, a base and an L-shaped support sleeved outside the medium wave infrared detector; the shell is sleeved outside the medium-wave infrared optical lens, the front end of the shell is provided with an infrared optical window in a sealing way through a window seat, the rear end of the shell is connected with the outer surface of the medium-wave infrared detector in a sealing way, and a sealing cavity is formed among the medium-wave infrared optical lens, the medium-wave infrared detector and the shell; the shell is provided with a vacuum valve and a vacuum gauge; the shell is fixed on the base; the heat transfer assembly comprises a first cushion block, a second cushion block and a heat pipe; the first cushion block is arranged between the L-shaped support and the refrigerator of the medium-wave infrared detector; the second cushion block is arranged between the base and the L-shaped support; one end of the heat pipe is inserted into the first cushion block, and the other end is inserted into the second cushion block.
Further, the shell is externally coated with a composite heat insulation layer, the number of coating layers of the composite heat insulation layer can be selected according to actual needs, and other heat insulation materials or heat insulation modes can be selected for heat insulation.
Further, a plurality of first bosses are arranged at the bottom of the first cushion block; the bottom surface of L type support is equipped with a plurality of second bosss. The arrangement of the boss reduces the contact area, reduces heat transfer, and can also adopt other modes such as a supporting frame, so long as the contact area can be reduced.
Further, the infrared optical window forms an included angle of 95 degrees with the axis of the mid-wave infrared optical lens.
Further, the shell is connected with the medium-wave infrared detector through a flexible welding corrugated pipe flange, and the L-shaped support is fixed on the flexible welding corrugated pipe flange; an indium wire layer is arranged between the flexible welding corrugated pipe flange and the shell, and the flexible welding corrugated pipe flange and the medium-wave infrared detector are sealed through vacuum sealant.
Further, the matching surface of the shell and the flexible welding corrugated pipe flange is an inclined surface, and the shell, the indium wire layer and the flexible welding corrugated pipe flange are sealed through vacuum sealant.
Further, the medium-wave infrared optical lens is connected with the shell through screws, and heat insulation pads are arranged at contact positions of the screws and the shell.
Further, heat conduction silicone grease is arranged between the second cushion block and the base; and a heat insulation pad is arranged at the joint of the shell and the base.
The assembly method of the medium wave refrigeration type infrared imaging system capable of realizing the passive temperature control is characterized by comprising the following steps of:
Step 1, sealing and connecting an infrared optical window and a window seat by using vacuum sealant;
or gold plating outside the infrared optical window, and then welding and sealing with the window seat;
step 2, coaxially fixing the medium-wave infrared optical lens in the shell;
Step 3, mounting a first cushion block between the L-shaped support and a refrigerator of the medium wave infrared detector;
step 4, synchronously completing the step 4.1 and the step 4.2;
step 4.1, the front part of the medium wave infrared detector is hermetically arranged in the shell, and the front end of the medium wave infrared detector is arranged at the tail part of the medium wave infrared optical lens;
step 4.2, installing a second cushion block between the base and the L-shaped support;
Step 5, mounting a vacuum valve and a vacuum gauge on the shell;
And 6, welding and sealing the window seat at the front end of the shell, and fixing the shell on the base.
Compared with the prior art, the invention has the beneficial effects that:
1. According to the invention, a sealed cavity is formed among the medium-wave infrared optical lens, the medium-wave infrared detector and the shell, the sealed cavity is vacuumized through the vacuum valve, the vacuumized condition is observed in real time through the vacuum gauge, and the heat preservation performance of the interior of the sealed cavity is ensured by utilizing the vacuumized sealed cavity. In addition, the heat transfer component can transfer the heat generated by the refrigerator of the medium wave infrared detector during operation to the bottom plate, and the heat pipe can also reduce the heat transfer to the L-shaped support. Through sealed cavity and heat transfer subassembly, even when being used for ambient temperature wide dynamic range, also can realize the long-range and the wide range detection to dark and weak target, the accuse temperature precision can reach + -5 ℃, has guaranteed the detection effect.
2. The shell of the invention is covered with the composite heat insulation layer, thereby further improving the heat insulation effect.
3. According to the invention, the bottoms of the first cushion block and the L-shaped support are respectively provided with the boss, so that the contact area between the first cushion block and the L-shaped support and the contact area between the L-shaped support and the second cushion block are reduced, the conduction heat resistance is increased, and the heat transfer from the first cushion block and the second cushion block to the L-shaped support is reduced.
4. The infrared optical window is obliquely arranged, so that cold reflection phenomenon caused by the flat glass is eliminated.
5. The indium wire layer seals between the shell and the flexible welding corrugated pipe flange on one hand, and the image plane can be adjusted by adjusting the thickness of the indium wire layer on the other hand.
6. According to the invention, the gap exists between the shell and the flexible welding corrugated pipe flange through the indium wire layer, the tightness is further ensured through the sealing of the vacuum sealant, and in addition, the matching surface of the shell and the flexible welding corrugated pipe flange is an inclined surface, so that the whole gap is conveniently filled by the vacuum sealant.
7. The heat insulation pad is arranged at the joint of the medium-wave infrared optical lens and the shell, so that heat transfer through the shell is further reduced.
8. The heat insulation pad is arranged at the joint of the shell and the base, so that heat transfer between the base and the shell is reduced.
9. According to the assembly method, through sealing installation in a certain sequence, the sealing of a cavity formed among the shell, the infrared optical window, the medium-wave infrared optical lens and the medium-wave infrared detector is ensured, and the heat preservation performance of the cavity is ensured; furthermore, the heat transfer component can further reduce the influence of the heat of the refrigerator of the medium wave infrared detector on the heat of the medium wave infrared optical lens; the connection of the medium wave infrared detector and the shell is synchronously carried out with the installation of the second cushion block, so that the levelness of the contact surface between the second cushion block and the base and the L-shaped support is ensured, and the installation stress generated by the installation of one end is avoided.
Drawings
FIG. 1 is a schematic diagram of a medium wave refrigeration type infrared imaging system capable of realizing passive temperature control;
FIG. 2 is an orthographic view of the axial section of FIG. 1;
FIG. 3 is an enlarged view of a portion of N in FIG. 2;
fig. 4 is a partial enlarged view at P in fig. 2.
The heat-conducting device comprises a 1-shell, a 2-infrared optical window, a 3-heat-conducting component, a 301-first cushion block, a 302-second cushion block, a 303-heat pipe, a 4-window seat, a 5-medium wave infrared optical lens, a 6-base, a 7-medium wave infrared detector, a 701-refrigerator, an 8-L-shaped support, an 801-second boss, a 9-vacuum valve, a 10-composite heat-insulating layer, an 11-flexible welded corrugated pipe flange, a 12-indium wire layer, 13-screws, a 14-heat-insulating pad, a 15-first boss and 16-vacuum sealant.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention and the accompanying drawings, and it is apparent that the described embodiments do not limit the present invention.
As shown in fig. 1 and fig. 2, a passive temperature control medium wave refrigeration type infrared imaging system can be implemented, wherein the medium wave refrigeration type infrared imaging system comprises a medium wave infrared optical lens 5, a medium wave infrared detector 7, an imaging circuit component and the like, the medium wave infrared detector 7 is connected to the rear end of the medium wave infrared optical lens 5, and when in installation, in order to play a supporting role on the medium wave infrared detector 7, the medium wave infrared detector 7 is stable, and an L-shaped support 8 is sleeved outside the medium wave infrared detector 7. Also comprises a heat transfer component 3, a shell 1 and a base 6; the casing 1 is sleeved outside the medium wave infrared optical lens 5, the front end of the casing 1 is provided with an infrared optical window 2 through a window seat 4 in a sealing manner, the rear end of the casing 1 is connected with the outer surface of the medium wave infrared detector 7 in a sealing manner, a sealing cavity is formed among the infrared optical window 2, the medium wave infrared optical lens 5, the medium wave infrared detector 7 and the casing 1, a vacuum valve 9 and a vacuum gauge are arranged on the casing 1, the sealing cavity is vacuumized through the vacuum valve 9, the vacuum gauge can be used for observing the vacuum degree in the sealing cavity in real time, and under the condition of good vacuum tightness, the required vacuum degree in the sealing cavity is related to the temperature control precision, the system working environment, the vacuum degree maintaining time and the like of the medium wave refrigeration type infrared imaging system, and the specific vacuumized vacuum degree is determined according to system indexes. The housing 1 is fixed to the base 6.
In addition, a heat transfer component 3 is arranged between the refrigerator 701 of the intermediate wave infrared detector 7 and the base 6, and heat generated when the refrigerator 701 works is transferred to the base 6 through the heat transfer component 3, so that the environment adaptability of the intermediate wave infrared detector 7 is improved. Wherein the heat transfer assembly 3 comprises a first pad 301, a second pad 302 and a heat pipe 303; the first cushion block 301 is arranged between the L-shaped support 8 and the refrigerator 701 of the medium wave infrared detector 7; the second cushion block 302 is arranged between the base 6 and the L-shaped support 8; in another embodiment of the present invention, the bottom of the first pad 301 is provided with a plurality of first bosses 15; the bottom surface of L type support 8 is equipped with a plurality of second bosss 801, and first boss 15 has reduced the area of contact between first cushion 301 and the L type support 8, reduces the heat transfer of refrigerator 701 to mid-wave infrared detector 7 and mid-wave infrared optical lens 5, and the same thing, second boss 801 has reduced the area of contact between L type support 8 and the second cushion 302, has reduced the heat transfer between L type support 8 and the second cushion 302. One end of the heat pipe 303 is inserted into the first cushion block 301, the other end of the heat pipe 303 is inserted into the second cushion block 302, part of heat transferred to the first cushion block 301 by the refrigerator 701 is directly transferred to the second cushion block 302 by the heat pipe 303, and the first cushion block 301 and the second cushion block 302 can be made of materials with good heat conductivity such as copper.
In one embodiment of the present invention, the composite heat insulation layer 10 may be covered outside the housing 1 for further heat preservation of the sealed chamber and heat dissipation reduction.
In the aspect of inhibiting the cold reflection of the medium wave refrigeration type infrared imaging system, besides controlling the incidence angle and incidence height of the marginal light of the central view field at the surface of each lens and plating an antireflection film on each lens in the design process of the infrared optical system, the infrared optical window 2 can be designed to be inclined by 5 degrees, namely, the infrared optical window 2 and the axis of the medium wave infrared optical lens 5 form an included angle of 95 degrees, so that the cold reflection phenomenon caused by the flat glass can be eliminated.
As shown in fig. 1 to 4, the casing 1 and the mid-wave infrared detector 7 can be connected through a flexible welding bellows flange 11, the vacuum valve 9 and the vacuum gauge can also be installed on the flexible welding bellows flange 11, the flexible welding bellows flange 11 and the mid-wave infrared detector 7 can be assembled by adopting a centering process, then are sealed by adopting a vacuum sealant 16, the L-shaped support 8 is fixed on the flexible welding bellows flange 11, and an indium wire layer 12 is arranged between the flexible welding bellows flange 11 and the casing 1. The indium wire layer 12 can have an image plane adjusting function by adjusting the thickness of the indium wire layer 12 in addition to the sealing function. When the shell 1 and the flexible welding corrugated pipe flange 11 are processed, a section of inclined plane can be processed on the matching surfaces of the shell 1 and the flexible welding corrugated pipe flange 11, as the indium wire layer 12 is arranged between the matching surfaces, gaps exist between the matching surfaces of the shell 1 and the flexible welding corrugated pipe flange 11 due to the thickness of the indium wire layer 12, and the vacuum sealant 16 is injected into the gaps, if the inclined plane inclination angle is 3 degrees, the vacuum sealant 16 can fill the whole gaps conveniently, and the tightness of the vacuum sealant is ensured.
The middle wave infrared optical lens 5 and the shell 1 can be connected through the screw 13, and the flange inside the screw 13 and the shell 1, namely the connection part of the screw 13, are all provided with the heat insulation pad 14, so that the heat of the shell 1 is prevented from being transferred to the middle wave infrared optical lens 5. Similarly, a heat-conducting silicone grease is arranged between the second cushion block 302 and the base 6, and a heat-insulating pad is arranged at the joint of the shell 1 and the base 6, so as to reduce heat transfer.
The invention also includes an assembly method of the imaging system, which comprises the following steps:
Step 1, sealing and connecting an infrared optical window 2 and a window seat 4 by using vacuum sealant 16;
Or gold plating the outside of the infrared optical window 2, and then welding and sealing with the window seat 4;
step 2, coaxially fixing the medium-wave infrared optical lens 5 in the shell 1;
Step 3, a first cushion block 301 is arranged between an L-shaped support 8 and a refrigerator 701 of the medium wave infrared detector 7;
step 4, synchronously completing the step 4.1 and the step 4.2, and eliminating the installation stress;
step 4.1, the front end of the medium wave infrared detector 7 is hermetically arranged in the shell 1, and the front end of the medium wave infrared detector 7 is arranged at the tail part of the medium wave infrared optical lens 5;
step 4.2, installing a second cushion block 302 between the base 6 and the L-shaped support 8;
The connection of the medium wave infrared detector 7 and the shell 1 is synchronously carried out with the installation of the second cushion block 302, so that the levelness of the contact surface between the second cushion block 302 and the base 6 and the L-shaped support 8 is ensured, and the installation stress generated by the installation of one end is avoided.
Step 5, mounting a vacuum valve 9 and a vacuum gauge on the shell 1;
and 6, welding and sealing the window seat 4 on the front end of the shell 1, and fixing the shell 1 on the base 6.
Wherein, the sequence position of the step 5 and the step 6 in the whole process can be adjusted according to the requirement.
In the foregoing imaging system and assembly method, the vacuum sealant 16 is used, and after being injected into the corresponding position, the vacuum sealant needs to be placed in a vacuum drying oven to discharge air bubbles in the vacuum sealant 16, so as to ensure sealing performance.
The specific operation can be also as follows:
(1) Sealing the infrared optical window 2 and the window seat 4 by using vacuum sealant, and then placing the window and the window seat into a vacuum drying oven to be solidified to form vacuum sealant 16; or gold plating the outer circle of the infrared optical window 2, and then welding and sealing with the window seat 4;
(2) The medium wave infrared optical lens 5 is fixedly connected with the shell 1 through 4M 4 screws and the heat insulation pad 14;
(3) The L-shaped support 8 and the flexible welded corrugated pipe flange 11 are positioned through 2 pins and then fixed through 4M 4 screws;
(4) The medium wave infrared detector 7 is fixed with the heat transfer component 3 through 4M 4 screws;
(5) Leveling the plane of the heat transfer component 3 and the plane of the L-shaped support 8, and then gluing the middle-wave infrared detector 7 and the flexible welded corrugated pipe flange 11 by using vacuum sealant 16; meanwhile, in order to prevent heat generated by the refrigerator 701 of the medium wave infrared detector 7 from being transferred to the L-shaped support 8, the bottom surface of the first cushion block 301 of the heat transfer assembly 3 is processed into 4 bosses, so that the conduction heat resistance is increased, and a heat insulation pad is additionally arranged at the contact position between the first cushion block 301 and the L-shaped support 8; after the gluing is finished, the glue is put into a vacuum drying oven to be solidified to form a vacuum sealing glue layer;
(6) Mounting the vacuum valve 9 and the vacuum gauge on the housing 1 or the flexible welded bellows flange 11;
(7) The shell 1 is fixedly connected with the base 6 through 4M 4 screws and 4 heat insulation pads;
(8) An indium wire layer 12 is additionally arranged between the shell 1 and the flexible welding corrugated pipe flange 11, image plane adjustment is carried out by adjusting the thickness of the indium wire layer 12, positioning is carried out by 2 pins, and then fixation is carried out by 8M 4 screws; simultaneously, the second cushion block 302 of the heat transfer assembly 3 is fixedly connected with the base 6 through 4M 4 screws; in order to better transfer the heat at the heat transfer component 3 to the base 6, heat-conducting silicone grease is smeared at the contact surface; in order to prevent the stress generated when the second cushion block 302 is installed after the first cushion block 301 is installed, the total of 12M 4 screws in the step of fixing 12 are sequentially adjusted;
(9) Injecting vacuum sealant at the gap between the shell 1 and the contact surface of the flexible welding corrugated pipe flange 11, and placing the vacuum sealant into a vacuum drying oven for curing after the gluing is finished to form a vacuum sealant layer;
(10) Wiping the first piece of optical glass of the intermediate wave infrared optical lens 5, and then welding and sealing the window seat 4 and the shell 1 to form a welding line;
(11) The composite heat insulation layer is wrapped outside the shell 1;
(12) After the steps are finished, vacuum requirements are obtained according to theoretical analysis, vacuum is pumped into the sealed cavity among the infrared optical window 2, the medium wave infrared optical lens 5, the shell 1 and the flexible welding corrugated pipe flange 11, and then the medium wave refrigeration type infrared imaging system is placed into a high-low temperature box for imaging test, so that the passive temperature control performance of the imaging system is verified.
The medium wave refrigeration type infrared imaging system capable of realizing passive temperature control provided by the invention can be used in a wide dynamic range of an ambient temperature of-70 ℃ to +70 ℃ through practical verification, so as to realize long-distance and large-range detection of a dark and weak target, and the temperature control precision can reach +/-5 ℃ to ensure the detection effect.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the present invention and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present invention.
Claims (6)
1. The medium wave refrigerating type infrared imaging system capable of realizing passive temperature control comprises a medium wave infrared detector (7) and a medium wave infrared optical lens (5), and is characterized in that: the infrared detector also comprises a heat transfer component (3), a shell (1), a base (6) and an L-shaped support (8) sleeved outside the medium wave infrared detector (7);
The shell (1) is sleeved outside the medium-wave infrared optical lens (5), an infrared optical window (2) is arranged at the front end of the shell (1) in a sealing way through a window seat (4), the rear end of the shell is in sealing connection with the outer surface of the medium-wave infrared detector (7), and a sealing cavity is formed among the medium-wave infrared optical lens (5), the medium-wave infrared detector (7) and the shell (1); a vacuum valve (9) and a vacuum gauge are arranged on the shell (1); the shell (1) is fixed on the base (6);
The heat transfer assembly (3) comprises a first cushion block (301), a second cushion block (302) and a heat pipe (303); the first cushion block (301) is arranged between the L-shaped support (8) and a refrigerator (701) of the medium-wave infrared detector (7); the second cushion block (302) is arranged between the base (6) and the L-shaped support (8); one end of the heat pipe (303) is inserted into the first cushion block (301), and the other end is inserted into the second cushion block (302);
The shell (1) is coated with a composite heat insulation layer (10);
The medium-wave infrared optical lens (5) is connected with the shell (1) through a screw (13), and heat insulation pads (14) are arranged at the contact positions of the screw (13) and the shell (1);
A heat conduction silicone grease is arranged between the second cushion block (302) and the base (6); the heat insulation pad (14) is arranged at the joint of the shell (1) and the base (6).
2. The medium wave refrigeration type infrared imaging system capable of realizing passive temperature control as set forth in claim 1, wherein: the bottom of the first cushion block (301) is provided with a plurality of first bosses (15); the bottom surface of L type support (8) is equipped with a plurality of second bosss (801).
3. The medium wave refrigeration type infrared imaging system capable of realizing passive temperature control as set forth in claim 2, wherein: the infrared optical window (2) and the axis of the medium-wave infrared optical lens (5) form an included angle of 95 degrees.
4. A medium wave refrigeration type infrared imaging system capable of realizing passive temperature control as set forth in claim 3, wherein: the shell (1) is connected with the medium-wave infrared detector (7) through a flexible welding corrugated pipe flange (11), and the L-shaped support (8) is fixed on the flexible welding corrugated pipe flange (11); an indium wire layer (12) is arranged between the flexible welding corrugated pipe flange (11) and the shell (1), and the flexible welding corrugated pipe flange (11) and the medium wave infrared detector (7) are sealed through vacuum sealant (16).
5. The medium wave refrigeration type infrared imaging system capable of realizing passive temperature control as set forth in claim 4, wherein: the matching surface of the shell (1) and the flexible welding corrugated pipe flange (11) is an inclined surface, and the shell (1), the indium wire layer (12) and the flexible welding corrugated pipe flange (11) are sealed through vacuum sealant (16).
6. The method for assembling a passive temperature-controlled mid-wave refrigeration type infrared imaging system according to any one of claims 1 to 5, comprising the steps of:
step 1, sealing and connecting an infrared optical window (2) and a window seat (4) by using vacuum sealant (16);
or gold plating the outside of the infrared optical window (2), and then welding and sealing with the window seat (4);
Step 2, coaxially fixing the medium-wave infrared optical lens (5) in the shell (1);
Step3, a first cushion block (301) is arranged between an L-shaped support (8) and a refrigerator (701) of a medium wave infrared detector (7);
step 4, synchronously completing the step 4.1 and the step 4.2;
Step 4.1, the front part of the medium wave infrared detector (7) is hermetically arranged in the shell (1), and the front end of the medium wave infrared detector (7) is arranged at the tail part of the medium wave infrared optical lens (5);
Step 4.2, installing a second cushion block (302) between the base (6) and the L-shaped support (8);
Step 5, mounting a vacuum valve (9) and a vacuum gauge on the shell (1);
and 6, welding and sealing the window seat (4) at the front end of the shell (1), and fixing the shell (1) on the base (6).
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2421570Y (en) * | 2000-01-20 | 2001-02-28 | 保定市通达加热设备有限公司 | High-temp far-infrared directional radiator with vacuum thermal-protective coating |
| CN107340061A (en) * | 2017-05-31 | 2017-11-10 | 中国电子科技集团公司第十研究所 | A kind of infrared detector ice chest |
| CN109323768A (en) * | 2018-10-19 | 2019-02-12 | 中国计量科学研究院 | A kind of self calibration blackbody radiation source |
| CN210862929U (en) * | 2019-10-28 | 2020-06-26 | 中国科学院西安光学精密机械研究所 | Medium wave refrigeration type infrared imaging system capable of realizing passive temperature control |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2874691B1 (en) * | 2004-08-24 | 2006-11-17 | Ulis Soc Par Actions Simplifie | ELECTROMAGNETIC RADIATION DETECTION COMPONENT, IN PARTICULAR INFRARED, INFRARED IMAGING OPTICAL BLOCK INCORPORATING SUCH A COMPONENT AND METHOD FOR PRODUCING THE SAME |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2421570Y (en) * | 2000-01-20 | 2001-02-28 | 保定市通达加热设备有限公司 | High-temp far-infrared directional radiator with vacuum thermal-protective coating |
| CN107340061A (en) * | 2017-05-31 | 2017-11-10 | 中国电子科技集团公司第十研究所 | A kind of infrared detector ice chest |
| CN109323768A (en) * | 2018-10-19 | 2019-02-12 | 中国计量科学研究院 | A kind of self calibration blackbody radiation source |
| CN210862929U (en) * | 2019-10-28 | 2020-06-26 | 中国科学院西安光学精密机械研究所 | Medium wave refrigeration type infrared imaging system capable of realizing passive temperature control |
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